2. Tow Vehicle Installation
2.1 Short form Vehicle Installation Guide
2.1.1 General Remarks
Normally, the delivery of a Dynatest FWD/HWD Test System does not include a towing
vehicle.
In this section, therefore, are given all Installation Instructions (and hints) necessary to
prepare a towing vehicle for a proper FWD/HWD System Setup.
In this section are NOT described all the “non-permanent” connections (regarding
transducers, computer power and interface cable) which are performed using quick-connect
plugs - refer to subsequent sections 7, “Connecting the Electronics” and 12,
“Transducers/Cables” for descriptions and cable diagrams.
The Hardware Installation Instructions are given below in a rather short form, backed up by
supplementary Notes where necessary (to be found in subsection 2.2).
Items followed by “(provided)” will be included in the system delivery or be shipped in
advance of delivery if so agreed.
2.1.2 Vehicle Type
The towing vehicle should be of adequate size and engine power to tow the FWD/HWD
trailer with max. permissible weight. The engine compartment should preferably allow for
space for an additional alternator (see below).
2.1.3 Trailer Hitch
The vehicle should be fitted with a trailer hitch with a 50 mm (or 2”) diameter hitch ball, the
centre of which should be located 480-500 mm (18-20”) above ground level when LOADED
with some 100kg (see also Note 2.2.1). The hitch must be rated for towing of the FWD/HWD
trailer max. permissible weight.
2.1.4 Trailer Lights Socket (provided)
A trailer tail lights connection socket should be mounted on the rear of the towing vehicle
close to the towing hitch ball (preferably in front of and some 200 mm to any side of the ball)
(see also Note 2.2.2).
2.1.5 Additional 12V Alternator
For optimum powering of the FWD/HWD Test System, an UUadditionalUU 12V alternator of at
least 60 Amp. output capacity, preferably 90 Amp. or more (HWD: at least 90 Amp.,
preferably 110 Amp. or more) should be mounted onto (and belt driven by) the vehicle engine
(see Note 2.2.3). ALTERNATIVELY, IF this solution is not possible/desirable, the vehicle’s
own (existing) alternator MAY be used under certain conditions. A third solution is using an
optional trailer mounted Power Unit, see notes in the following.
2.1.6 Using/ (Replacing) the Existing Vehicle Alternator
If it is NOT possible or desirable to mount an ADDITIONAL alternator in the towing vehicle,
then the vehicle’s EXISTING alternator MAY alternatively be used, IF it has an adequate
current output rating (FWD: at least 90 Amp. output capacity, preferably 110 Amp. HWD: at
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